Contains 10% Benzoyl Peroxide (BPO) - a very effective antibacterial lotion for treating acne and acne-prone skin. Our acne treatment lotion assists by killing acne-causing bacteria (c. acnes bacteria - previously known as p.acnes) and helping to clear dead skin and oil from pores. Jan Marini Skin Research uses ultra-micronized BPO to get even greater penetration into the skin while minimizing sensitivity and irritation common with many benzoyl peroxide solutions.